# G3_FrustumW

## C Specification

      #include <nitro/gx/g3_util.h>

      void G3_FrustumW(
          fx32        t,
          fx32        b,
          fx32        l,
          fx32        r,
          fx32        n,
          fx32        f,
          fx32        scaleW,
          MtxFx44*    mtx );

## Description

This function sets the Matrix mode to the Projection mode. This function also sets the Frustum matrix as the current matrix. If `mtx` is not `NULL`, then the frustum matrix is also set in *`mtx`. This function uses the Divider.

The diagram shows the matrix that is set.

X scaleW

## Arguments

`t` | Y coordinate at the top of the near clipping plane
`b` | Y coordinate at the bottom of the near clipping plane
`l` | X coordinate at the left of the near clipping plane
`r` | X coordinate at the right of the near clipping plane
`n` | The distance from the eyepoint to the near clipping plane
`f` | The distance from the eyepoint to the far clipping plane
`scaleW` | Fine adjustment parameter for the view volume
`mtx` | Pointer to a 4x4 matrix

## Return Values

None

## See Also

`G3_Frustum, G3_PerspectiveW, G3_OrthoW`

## Revision History

04/27/2004 Initial Version